Automatic duplex steam-pump.



2 SHEETS-SHEET 1.

Fluiuaufoz W PATENTED JUNE 16, 1903.

A. JACK. AUTOMATIC DUPLEX STEAM PUMP.

APPLICATION FILED MAB. 3, 1902.

N0 MODEL.

No. 730,917. PATENTED JUNE 16, 1903. A. JACK.

AUTOMATIC DUPLEX STEAM PUMP.

APPLICATION FILED MAR. 31 1902.

N0 MODEL. SHEETS-fiHBET 2.

UNITED STATES ,Patented June 16, 1903.

PATENT OFFICE.

ALEXANDER JACK, OF EVANSVILLE, INDIANA.

AUTOMATIC DUPLEX STEAM-PUMP.

SPECIFICATION formingpart of Letters Patent No. 730,917, dated June 16,1903.

Application filed March 3,1902. Serial No. 96,492. (No model.)

To all whmn it may concern.-

Be it known that LALEXANDEB JACK, a citizen of the United States,residing at Evansville, county of Vanderburg and State of Indiana, haveinvented certain new and useful Improvements in Automatic Duplex Steam-Pumps, of which the following is a specification.

My invention relates to automatic duplex steam-pumps.

It is a well-known fact that the ordinary steam-pump has to be primed onbeing started, which is of course a drawback; and one object of thepresent invention is to provide novel means whereby my steam-pump willbe adapted to start without the necessity of priming it.

Other objects of the invention are the provision of a novel interiorconstruction for the guidance of the plunger in the water-cylinder, theprevention of access of foreign material to the valves, and the generalimprovement of a pump of this class.

To accomplish the foregoing objects, I provide certain improvements andnovel combinations and arrangements of parts which are fully explainedhereinafter, while the novel features are recited in the appended claim.

In the accompanying drawings, Figure 1 is a side elevation; Fig. 2, anend elevation; Fig, 3, a longitudinal section through the water-cylinderand differential chambers and the piston; Fig.- 4, a detail of thedischargingvalve, and Fig. 5 a detail of the receivingvalve.

Inasmuch as both pumping actions in my duplex pump are similar, only oneside of the pump will be described.

The numeral 1 designates the bed-plate, which supports the variousmechanisms, and seated on this bed-plate is a diiferential water-chamber2, having the separate chambers 3 and 4, between which is the solidpartition 5. Depending in the chambers 3 and 4 are the pipes 6 and 7,having strainers Sat their lower portions, Where they are immersed inthe water, to exclude any foreign material from the valves. There areindependent receivingvalve casings 9 and 10 in communication by pipes 11with the respective chambers 3 and 4, and inside of these casings arethe inlet or receiving valves 12. Both valve-casings are connected to acommon suction-pipe 13, which Will lead to'the point from which thewater is to be drawn. The common suction-pipes 13 of the two sides ofthe pump can be connected together, if desired. In the ends of thedifferential chamber 2 are drain-plugs 14, preferably two being providedfor the respective chambers 3 and 4, thus providing means whereby thewater within the chambers may be drawn off in cold weather. Above andsupported by the differential chamber is a water-cylinder 16, having theusual cylinderheads and provided with a septum 0r partition 17 for thesupport of the water-plunger. The Water-cylinder is thus divided intotwo chambers 18 and 19, in communication with the chambers 3 and 4 bythe pipes 20 and 21.

The numeral 22 designates the water plunger or piston, to which isconnected pistonrod 23, and the plunger moves in a packinggland 24, heldin the septum 17 by a packingring 25, bolts 26 being employed to securethe parts.

Above the water-cylinder and supported thereon in communication with therespective chambers 18 and 19 by the pipes 27 and 28 are thedischarging-valve chambers 29 and 30, which are surmounted by thecoldair chambers 31 and 32, having the removable plugs 33. In eachdischarging-valve casing is a valve 34, which controls the flow of waterinto the bridge-pipe 35, from which leads the discharging-pipe 36. Thedischarge-pipes 36 from the two sides of the pump can be 0011-nectedtogether and have a common dischargepipe, if desired.

The pump on one stroke will draw up water from one of the differentialchambers into one of the chambers of the water-cylinder and force waterout of the other chamber of the water-cylinder and into thedischarge-valve casing communicating therewith and thence to the pointwhere the water is to be delivered, while also drawing up water from thesource of supply into the diiferential chamber from which the water isbeing drawn. On' the opposite stroke of the water plunger being made areverse of these operations will take place. The differential chambersare thus kept continually supplied with Water, and when the pump isstopped they will contain a sufficient quantity of water to start thepump on its being again put into operation, thereby obviating thenecessity for priming the pump. The operation described is the same onboth sides of the pump.

I am aware that various changes of construction might be resorted to incarrying out my invention without departing from its mode of operationor materially changing its structure, and I do not, therefore, limitmyself to the precise construction herein shown and described, butconsider that I am entitled to all such modifications as come within thespirit and scope of the invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a pump, the combination with a watercylinder having independentcompartments,

ALEXANDER JACK.

\Vitncsses:

J OHN BROWNLE WILLIAM M. SMITH.

